US4883719A - Method of surface impregnation of wood articles and wood articles made therewith - Google Patents

Method of surface impregnation of wood articles and wood articles made therewith Download PDF

Info

Publication number
US4883719A
US4883719A US07/272,495 US27249588A US4883719A US 4883719 A US4883719 A US 4883719A US 27249588 A US27249588 A US 27249588A US 4883719 A US4883719 A US 4883719A
Authority
US
United States
Prior art keywords
weight
wood
parts
monomer
approximately
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/272,495
Inventor
Keith I. Brebner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TINGLEY DAN
Original Assignee
Wood Polymer Composite Processes Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wood Polymer Composite Processes Ltd filed Critical Wood Polymer Composite Processes Ltd
Assigned to WOOD POLYMER COMPOSITE PROCESSES LTD., P.O. BOX 3548, STATION B, FREDERICTON, N.B., E3A 5J8 A CORP. OF CANADA reassignment WOOD POLYMER COMPOSITE PROCESSES LTD., P.O. BOX 3548, STATION B, FREDERICTON, N.B., E3A 5J8 A CORP. OF CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BREBNER, KEITH I.
Application granted granted Critical
Publication of US4883719A publication Critical patent/US4883719A/en
Assigned to TINGLEY, DAN reassignment TINGLEY, DAN ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WOOD POLYMER COMPOSITE PROCESSES INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/06—Unsaturated polyesters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/4935—Impregnated naturally solid product [e.g., leather, stone, etc.]
    • Y10T428/662—Wood timber product [e.g., piling, post, veneer, etc.]

Definitions

  • This invention pertains to a method of surface impregnation of wood articles with a plastic and the resulting wood articles.
  • Plastic impregnation of wood is known. Indeed a number of processes that deal with the treatment of wood with vinyl monomer modified unsaturated polyester resins, i.e., a monomer-prepolymer combination have been described in the literature.
  • the monomer normally styrene, has a very low viscosity in relation to the ester prepolymer.
  • the styrene can substantially penetrate the wood leaving the polyester more concentrated in the surface region.
  • this separation will result in a chemical gradient in the wood. After polymerization the surface tends to remain tacky and is unsuitable as a finish.
  • U.S. Pat. No. 2,591,768 also deals with the problem of surface tackiness by applying liquid sealants, e.g., high melting waxes, to the wood prior to polymerization.
  • liquid sealants e.g., high melting waxes
  • Japanese Patents no. 74/92,204 and 74/92,205 (Urasugi et al.) describe the use of a diallyl phthalate monomer-prepolymer mixture dissolved in acetone (approx. a 50:50 ratio) to produce a wood-polymer composite having reduced stickiness.
  • acetone approximately a 50:50 ratio
  • the volatile and highly flammable acetone is allowed to evaporate before thermal polymerization. Since acetone can swell the wood cell wall, the wood will undergo dimensional changes during treatment and potentially result in some distortion.
  • An object of this invention is to provide a method for the surface impregnation of a finished sanded wood article with a plastic.
  • Another object of the present invention is to provide a method for the impregnation of the surface substrate region of sanded wood articles resulting in a tough buffable surface finish.
  • the third object of the present invention is to provide a wood surface substrate impregnation method which avoids:
  • the articles may then be buffed to the desired finish.
  • the monomer-prepolymer may be diallyl m-phthalate or diethylene glycol bis (allyl carbonate).
  • finished-sanded wood articles are loaded into a basket and placed in a vacuum-pressure vessel.
  • the wood is degassed to a specified partial pressure and a diallyl phthalate monomer-prepolymer solution is drawn into the treatment chamber while maintaining the specified partial pressure until the wood articles are covered.
  • the pressure is then raised to atmospheric pressure and the articles are allowed to soak in the confining solution for 4 hours or until such time that adequate penetration is achieved.
  • the basket is then raised out of the solution and allowed to drain. Polymerization is carried out in a forced air oven at approximately 200-210 deg. F to avoid gross warpage.
  • the cured articles are then buffed to the desired finish.
  • the polymerizable solution is prepared as follows:
  • Trembling aspen sapwood moulding 1.5 ⁇ 5/16 ⁇ 30 inches, was placed in a vacuum-pressure vessel, degassed to 400 torr and held for 15 minutes. The solution shown above was drawn into the vessel while maintaining 400 torr until the mouldings were completely covered. The partial pressure was returned to atmospheric and the mouldings were allowed to soak for 4 hours. They were then removed, allowed to drain and cured overnight at 200 deg. F. Finally, the treated mouldings were buffed to the desired finish.
  • the conversion of polymerizable solution to polymer ranged from 70-80% when corrected for moisture content loss (typically 6-9%).
  • the treated surface was much more scratch resistant and had the feel of a higher density wood moulding but without the equivalent weight. It was possible to nail the treated moulding, except within 1 to 1.5 inches of an exposed end where the polymer concentration was greatest.
  • the degassing pressure from 400 torr, the solution uptake in the aspen can be altered. After impregnation the density of the monomer-prepolymer solution (1.145 g/cc. at 70 deg. F with 25% by weight of prepolymer) increases and catalysed monomer must be added to maintain the solution density at 1.145 g/cc.
  • Example 1 finish-sanded sycamore shotgun stocks and forearms, provided by U.S. Repeating Arms of New Haven, CT., were impregnated.
  • the uptake of polymerizable solution ranged from 20-30% and the conversion ranged from 70-80% when corrected for moisture content loss (6-9%).
  • the buffed surface had higher abrasion resistance than untreated sycamore.
  • finish-sanded sugar maple sapwood brush handles were impregnated.
  • the uptake of polymerizable solution ranged from 25-40% and depended on the size and configuration of the brush handle.
  • the conversion ranged from 60-70%.
  • the brush handles were more moisture resistant after treatment.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Forests & Forestry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

This invention pertains to a method of surface impregnation of wood articles with a plastic and to the resulting wood articles. The method includes treating dried, finished wood articles comprising the steps of degassing the wood to a specified partial pressure, soaking the degassed wood at atmospheric pressure in a diallyl o-phthalate monomer-prepolymer solution for a specified time and polymerizing in the range of 200-210 deg. F in a forced air oven. The cured samples can then be buffed to obtain the desired finish.

Description

FIELD OF THE INVENTION
This invention pertains to a method of surface impregnation of wood articles with a plastic and the resulting wood articles.
DESCRIPTION OF THE PRIOR ART
Plastic impregnation of wood is known. Indeed a number of processes that deal with the treatment of wood with vinyl monomer modified unsaturated polyester resins, i.e., a monomer-prepolymer combination have been described in the literature. The monomer, normally styrene, has a very low viscosity in relation to the ester prepolymer. Thus, when a wood article is vacuum-pressure impregnated with this mixture, the styrene can substantially penetrate the wood leaving the polyester more concentrated in the surface region. Unfortunately, this separation will result in a chemical gradient in the wood. After polymerization the surface tends to remain tacky and is unsuitable as a finish.
U.S. Pat. No. 3,336,959 (Parks) resolved this problem by coating the impregnated wood with a diallyl phthalate monomer-prepolymer solution. Heating caused the diallyl phthalate and polyester resin to crosslink. Parks indicated that the monomer modified unsaturated polyester was easy to use within the wood article, whereas the diallyl phthalate solution was a hard to handle impregnant and best applied on the surface.
Parks conducted high temperature polymerization (250-300 deg. F) when using the diallyl phthalate monomer-prepolymer coating. Wood blanks were therefore conditioned at these temperatures prior to the actual machining of the wood articles. One of the objectives was to relieve internal stresses in the wood that could release during subsequent polymerization, leaving the article warped. Another objective was to prevent internal pressure from the water vapour trapped in the center of the wood from causing the impregnant to exude from the surface of the article. Because bone-dry wood will splinter during machining, the blanks had to be equilibrated to 3 to 5% moisture content prior to producing the wood article. The major drawback of this method is that wood article requires thermal conditioning to relieve internal stresses before impregnation.
U.S. Pat. No. 2,591,768 (Austin) also deals with the problem of surface tackiness by applying liquid sealants, e.g., high melting waxes, to the wood prior to polymerization. The drawback of this method is that if the sealant needs to be stripped after curing then the said method adds two more processes to reach the same goal.
Japanese Patents no. 74/92,204 and 74/92,205 (Urasugi et al.) describe the use of a diallyl phthalate monomer-prepolymer mixture dissolved in acetone (approx. a 50:50 ratio) to produce a wood-polymer composite having reduced stickiness. The volatile and highly flammable acetone is allowed to evaporate before thermal polymerization. Since acetone can swell the wood cell wall, the wood will undergo dimensional changes during treatment and potentially result in some distortion.
It is well known that liquid flow into wood is almost exclusively along the grain. Measurements show that the longitudinal permeability is orders of magnitude greater than the permeability in either the radial or tangential directions. This prevents the surface treatment of wood with polymerizable monomers from forming a wood-polymer surface shell around the wood (Meyer, J.A., the Chemistry of solid wood, Wood polymer materials; American Chemical Society, 1984, 257-289).
Because penetration is much faster through the endgrain, monomer can penetrate deeply in to the wood interior where enhancement of mechanical properties is not so important. Deep penetration of monomer may cause increased usage of monomer and increased weight of treated product, without corresponding benefit. We have found that it is possible to impregnate wood with a diallyl phthalate monomer-prepolymer solution, where the penetration of the solution into the wood is substantially confined to the surface areas of the wood where the enhancement of the mechanical properties is most useful. However, this is contrary to what would be predicted in view of the prior art.
OBJECTS OF THE PRESENT INVENTION
An object of this invention is to provide a method for the surface impregnation of a finished sanded wood article with a plastic.
Another object of the present invention is to provide a method for the impregnation of the surface substrate region of sanded wood articles resulting in a tough buffable surface finish.
The third object of the present invention is to provide a wood surface substrate impregnation method which avoids:
pre-conditioning at elevated temperatures;
swelling with volatile solvents which can result in grain raising and distortion; and
the use of sealants.
DESCRIPTION OF THE INVENTION
In order to achieve these and other objects, there is provided a method for the surface impregnation of a dried finished wood article with a plastic comprising the following steps:
(a) degassing the wood article to a predetermined partial pressure;
(b) soaking the degassed wood article in a catalysed diallyl o-phthalate monomer-prepolymer solution for a predetermined period;
(c) polymerizing at approximately 200 to 210 deg. F.
The articles may then be buffed to the desired finish. The monomer-prepolymer may be diallyl m-phthalate or diethylene glycol bis (allyl carbonate).
DESCRIPTION OF A PREFERRED EMBODIMENT
Kiln-dried (6 to 8% moisture content), finished-sanded wood articles are loaded into a basket and placed in a vacuum-pressure vessel. The wood is degassed to a specified partial pressure and a diallyl phthalate monomer-prepolymer solution is drawn into the treatment chamber while maintaining the specified partial pressure until the wood articles are covered. The pressure is then raised to atmospheric pressure and the articles are allowed to soak in the confining solution for 4 hours or until such time that adequate penetration is achieved. The basket is then raised out of the solution and allowed to drain. Polymerization is carried out in a forced air oven at approximately 200-210 deg. F to avoid gross warpage. The cured articles are then buffed to the desired finish.
The application of this invention to wood articles having differing surface configurations and species type is set out below.
EXAMPLE 1 Trembling Aspen Sapwood Moulding
The polymerizable solution is prepared as follows:
______________________________________                                    
Chemical           Parts by weight                                        
______________________________________                                    
diallyl phthalate monomer                                                 
                   100                                                    
diallyl phthalate prepolymer                                              
                   25                                                     
benzoyl peroxide   1                                                      
t-butyl perbenzoate                                                       
                   2                                                      
______________________________________                                    
 Optionally, 3 parts of 1,1'-azobis (cyclohexanecarbonitrile) can be
 substituted for the benzoyl peroxide and t-butyl perbenzoate combination.
 Solid diallyl phthalate prepolymer can be mechanically mixed with the
 diallyl phthalate monomer to form the solution. Complete dissolution takes
 5 to 7 days. Another approach is to polymerize diallyl phthalate monomer
 using the usual methods of producing "prepolymers" and interrupt the
 polymerization process before gelation sets in (at about 25% conversion).
Trembling aspen sapwood moulding, 1.5×5/16×30 inches, was placed in a vacuum-pressure vessel, degassed to 400 torr and held for 15 minutes. The solution shown above was drawn into the vessel while maintaining 400 torr until the mouldings were completely covered. The partial pressure was returned to atmospheric and the mouldings were allowed to soak for 4 hours. They were then removed, allowed to drain and cured overnight at 200 deg. F. Finally, the treated mouldings were buffed to the desired finish.
The conversion of polymerizable solution to polymer ranged from 70-80% when corrected for moisture content loss (typically 6-9%). In relation to untreated aspen moulding the treated surface was much more scratch resistant and had the feel of a higher density wood moulding but without the equivalent weight. It was possible to nail the treated moulding, except within 1 to 1.5 inches of an exposed end where the polymer concentration was greatest. By changing the degassing pressure from 400 torr, the solution uptake in the aspen can be altered. After impregnation the density of the monomer-prepolymer solution (1.145 g/cc. at 70 deg. F with 25% by weight of prepolymer) increases and catalysed monomer must be added to maintain the solution density at 1.145 g/cc. Deeper penetration by the lower viscosity monomer accounts for the density increase in the solution and this separation effect is identical to that which occurs with polyester-styrene impregnants, but without the resultant surface tackiness. The extent of the density increase will be determined by the solution to wood ratio. The greater the ratio, the smaller the density increase.
EXAMPLE 2 Sycamore Shotgun Stocks and Forearms
Using the parameters outlined in Example 1, finish-sanded sycamore shotgun stocks and forearms, provided by U.S. Repeating Arms of New Haven, CT., were impregnated. The uptake of polymerizable solution ranged from 20-30% and the conversion ranged from 70-80% when corrected for moisture content loss (6-9%). The buffed surface had higher abrasion resistance than untreated sycamore.
EXAMPLE 3 Sugar Maple Sapwood Brush Handles
Using the parameters outlined in Example 1, finish-sanded sugar maple sapwood brush handles were impregnated. The uptake of polymerizable solution ranged from 25-40% and depended on the size and configuration of the brush handle. The conversion ranged from 60-70%. The brush handles were more moisture resistant after treatment.
Although the invention has been described with the use of specific examples its scope should not be limited thereto. Indeed, many variations may be made without departing from the spirit of the invention.

Claims (17)

I claim:
1. A method for the surface impregnation of a dried finished wood article with a plastic comprising the following steps:
(a) degassing the wood article to a predetermined partial pressure;
(b) soaking the degassed wood article in a catalysed diallyl o-phthalate monomer-prepolymer solution for a predetermined period;
(c) polymerizing at approximately 200 to 210 deg. F.
2. The method of claim 1 wherein the monomer-prepolymer is one diallyl m-phthalate or diethylene glycol bis (allyl carbonate).
3. The method of claim 1 wherein polymerization is carried out in a forced air oven.
4. The method of claim 1, wherein the solution comprises:
100 parts by weight of diallyl phthalate monomer
25 parts by weight of diallyl phthalate prepolymer
1 part by weight of peroxide
2 parts by weight of t-butyl perbenzoate.
5. The method of claim 1, wherein the partial pressure is approximately 400 Torr and the period is approximately 4 hours.
6. A surface impregnated wood article when made by the method of claim 1.
7. A surface impregnated wood article when made by the method of claim 4.
8. The method of claim 2 wherein the solution comprises:
100 parts by weight of diallyl phthalate monomer,
25 parts by weight of diallyl phthalate prepolymer,
1 part by weight of peroxide,
2 parts by weight of t-butyl perbenzoate.
9. The method of claim 3 wherein the solution comprises:
100 parts by weight of diallyl phthalate monomer,
25 parts by weight of diallyl phthalate prepolymer,
1 part by weight of peroxide,
2 parts by weight of t-butyl perbenzoate.
10. The method of claim 2 wherein the partial pressure is approximately 400 Torr and the period is approximately 4 hours.
11. The method of claim 3 wherein the partial pressure is approximately 400 Torr and the period is approximately 4 hours.
12. The method of claim 2 wherein the solution contains dyes and fire retardants.
13. The method of claim 3 wherein the solution contains dyes and fire retardants.
14. A surface impregnated wood article when made by the method of claim 2.
15. A surface impregnated wood article when made by the method of claim 3.
16. A surface impregnated wood article when made by the method of claim 5.
17. A surface impregnated wood article when made by the method of claim 6.
US07/272,495 1987-11-20 1988-11-17 Method of surface impregnation of wood articles and wood articles made therewith Expired - Lifetime US4883719A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000552414A CA1269899A (en) 1987-11-20 1987-11-20 Method of surface impregnation of wood articles and wood articles made therewith
CA552414 1987-11-20

Publications (1)

Publication Number Publication Date
US4883719A true US4883719A (en) 1989-11-28

Family

ID=4136891

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/272,495 Expired - Lifetime US4883719A (en) 1987-11-20 1988-11-17 Method of surface impregnation of wood articles and wood articles made therewith

Country Status (2)

Country Link
US (1) US4883719A (en)
CA (1) CA1269899A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2658445A1 (en) * 1990-02-22 1991-08-23 Janier Dubry Holding Sa Process for the treatment of a wood component with a view to stabilising it
WO1993003896A1 (en) * 1991-08-22 1993-03-04 Compagnie Generale Des Panneaux Cogepa S.A. Method for treating a wood element in order to stabilize it
US5423933A (en) * 1993-05-19 1995-06-13 Horian; Richard C. Fabrication of plastic and wood veneer composite
US5679407A (en) * 1993-05-28 1997-10-21 Finnforest Oy Method for the hardening of wood material
US5848169A (en) * 1994-10-06 1998-12-08 Duke University Feedback acoustic energy dissipating device with compensator
CN1066382C (en) * 1996-11-06 2001-05-30 康熙若 Wood/plastic compound material and method for preparing same
US20060127633A1 (en) * 2004-12-10 2006-06-15 Dimakis Alkiviadis G Reinforced wood product and methods for reinforcing a wood product

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591768A (en) * 1947-08-22 1952-04-08 Robert R Austin Method of resin impregnating wood
US2909450A (en) * 1956-06-27 1959-10-20 Koppers Co Inc Impregnating solutions and method of impregnation therewith
US3336959A (en) * 1966-05-10 1967-08-22 Robert F Parks Method of impregnating wooden articles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591768A (en) * 1947-08-22 1952-04-08 Robert R Austin Method of resin impregnating wood
US2909450A (en) * 1956-06-27 1959-10-20 Koppers Co Inc Impregnating solutions and method of impregnation therewith
US3336959A (en) * 1966-05-10 1967-08-22 Robert F Parks Method of impregnating wooden articles

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
"Impregnated Bobbins Are Found to Offer Better Wear Resistance".
"Maple Bobbins Get Protection".
"Wood-Polymer Materials" by Meyer, Advances in Chemistry Series, American Chemical Society, Washington, D.C. (1984).
Chemical Abstracts, vol. 84. *
Dimensional Stabilization of Wood with Furfuryl Alcohol Resin by Stamm, ACS, Washington, D.C. 1977. *
Impregnated Bobbins Are Found to Offer Better Wear Resistance . *
Maple Bobbins Get Protection . *
Wood Polymer Materials by Meyer, Advances in Chemistry Series, American Chemical Society, Washington, D.C. (1984). *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2658445A1 (en) * 1990-02-22 1991-08-23 Janier Dubry Holding Sa Process for the treatment of a wood component with a view to stabilising it
WO1993003896A1 (en) * 1991-08-22 1993-03-04 Compagnie Generale Des Panneaux Cogepa S.A. Method for treating a wood element in order to stabilize it
US5423933A (en) * 1993-05-19 1995-06-13 Horian; Richard C. Fabrication of plastic and wood veneer composite
US5679407A (en) * 1993-05-28 1997-10-21 Finnforest Oy Method for the hardening of wood material
US5848169A (en) * 1994-10-06 1998-12-08 Duke University Feedback acoustic energy dissipating device with compensator
CN1066382C (en) * 1996-11-06 2001-05-30 康熙若 Wood/plastic compound material and method for preparing same
US20060127633A1 (en) * 2004-12-10 2006-06-15 Dimakis Alkiviadis G Reinforced wood product and methods for reinforcing a wood product

Also Published As

Publication number Publication date
CA1269899A (en) 1990-06-05

Similar Documents

Publication Publication Date Title
US8197948B2 (en) Furan polymer impregnated wood, method for preparing the polymer and uses thereof
EP0702624B1 (en) Hardened and fire retardant wood products
AU2002222818A1 (en) Furan polymer impregnated wood, method for preparing the polymer and uses thereof
US4883719A (en) Method of surface impregnation of wood articles and wood articles made therewith
US3790401A (en) Method for the preparation of composite wood-polymer product
US4307155A (en) Process of making wood-polymer composite containing a dicyclopentenyl acrylate or methacrylate polymer and composite
US4250214A (en) Wood-polymer composite containing a dicyclopentenyl acrylate or methacrylate polymer
US3560255A (en) Composite wood-polymer product
US3579369A (en) Wood members impregnated with synthetic organic resins and method of producing such impregnated members
JP2595270B2 (en) Modified wood material and method for producing the same
US3553005A (en) Method for producing a plastic impregnated article
JPH06143205A (en) Manufacture of fungiproof wooden material
US3336959A (en) Method of impregnating wooden articles
JP3553660B2 (en) Manufacturing method of modified wood
US3242004A (en) Method of polymerizing tris-(1-oziridinyl)-phosphine oxide within wood and resultantproduct
JP2954748B2 (en) Method for producing synthetic resin-injected wood
US2811470A (en) Stabilized wood and a method for its production
JPH05138615A (en) Production of modified timber
JP7116404B2 (en) Method for producing furan polymer impregnated wood
JPH0356642B2 (en)
JPH0655508A (en) Manufacture of fungus resistant wooden material
JPH0929710A (en) Pretreating method for timber and manufacture of modified timber using the same
JPS63107502A (en) Improved woody material
WO1997039864A1 (en) A method for the production of wood-polymer composites
JPH06106507A (en) Production of wood composite material

Legal Events

Date Code Title Description
AS Assignment

Owner name: WOOD POLYMER COMPOSITE PROCESSES LTD., P.O. BOX 35

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BREBNER, KEITH I.;REEL/FRAME:005142/0041

Effective date: 19890114

REMI Maintenance fee reminder mailed
REIN Reinstatement after maintenance fee payment confirmed
FEPP Fee payment procedure

Free format text: PETITION RELATED TO MAINTENANCE FEES FILED (ORIGINAL EVENT CODE: PMFP); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

Free format text: PETITION RELATED TO MAINTENANCE FEES GRANTED (ORIGINAL EVENT CODE: PMFG); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

FP Lapsed due to failure to pay maintenance fee

Effective date: 19891128

FPAY Fee payment

Year of fee payment: 4

SULP Surcharge for late payment
STCF Information on status: patent grant

Free format text: PATENTED CASE

DP Notification of acceptance of delayed payment of maintenance fee
FPAY Fee payment

Year of fee payment: 8

AS Assignment

Owner name: TINGLEY, DAN, CANADA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WOOD POLYMER COMPOSITE PROCESSES INC.;REEL/FRAME:008613/0461

Effective date: 19970704